Made of 18/8 food grade stainless steel. Double wall vacuum insulated construction can be used for both hot and cold liquids. Allow hot liquids to cool to a safe temperature and make sure lid is secured properly before consumption; do not overfill with hot liquids. When filled with hot liquids, keep out of children’s reach. Do not use bleach or products containing chlorine when cleaning. Top rack dishwasher safe, hand was recommended for optimal care. Do not use in microwave.